add change log

Author: cksac

CHANGELOG.md

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+# Changelogs
+## v3.1.0
+- allow CityName to be overrite by each locale
+- Added DE_DE Locale (@xoryouyou [#75](https://github.com/cksac/fake-rs/pull/75))
+- Added fake cli (@akhildevelops [#209](https://github.com/cksac/fake-rs/pull/209))
+- Implement dummy for uuid v6, v7 (@LNSD [#207](https://github.com/cksac/fake-rs/pull/207))
+- Add Precision::<N> support for chrono::NaiveDateTime (@m4tx [#204](https://github.com/cksac/fake-rs/pull/204))
+
+